单项选择题
A.50mm B.75mm C.100mm D.125mm
A.15° B.30° C.45° D.60°
A.3种 B.5种 C.6种 D.8种
A.绿、黄、红 B.红、黄、绿 C.绿、红、黄 D.黄、红、绿
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